Apparatus for setting the angular relationship between rotating driving, and driven members

Abstract

An apparatus for setting the angular relationship between rotating driving, and driven members in the injection pump drive of an internal combustion engine. The driving member and the driven member have a toothed portion of which at least one is a helical toothed portion, whereby the toothed portions are coupled to each other by a coupler member having toothed portions which mesh with the toothed portions of the driving and driven members. At least one of the toothed portions of the coupler member is configured as a helical portion and is hydraulically displaceable with respect to the other toothed portions. This hydraulic displacement is controlled by a centrifugal governor having flyweights. The flyweights displace a valve member against the force of at least one spring in an rpm-dependent manner to effect the rpm-dependent adjustment of the instant of injection. In addition to the rpm-dependent displacement, a load-dependant displaceability, can be superimposed. As a result, the instant of injection can be influenced in accordance with load, in order thus to attain an improved combustion efficiency.

What is claimed and desired to be secured by Letters Patent of the United States is: 
     
       1. In an apparatus for setting the angular relationship between a rotating drive member and a driven member in the drive of a fuel injection pump of an internal combustion engine, said drive including: the drive member having a toothed portion; the driven member having a toothed portion; and a coupler having toothed portions complemental to the toothed portions of the drive member and the driven member, with at least one of the toothed portions of the drive member and driven member and the complemental toothed portion of the coupler being helical toothed portions, said apparatus including hydraulic displacement means for hydraulically displacing the coupler and thereby at least the driven member to attain an rpm-dependent adjustment of the instant of injection, said hydraulic displacement means including: a valve member; at least one spring; and a centrifugal governor having flyweights which produce an rpm-dependent displacement of the valve member against the force exerted by said at least one spring, and thereby the hydraulic displacement of the coupler and at least the driven member, the improvement in the apparatus comprising load-dependent displacement means connected to the hydraulic displacement means for further displacing the coupler and thereby at least the driven member in a load dependent manner, to attain a further adjustment of the instant of injection which is load-dependent, said load dependent displacement means including at least one prestressed spring.   
     
     
       2. The apparatus as defined in claim 1, wherein the fuel injection pump includes a regulator rod, and wherein the regulator rod applies a load-dependent input to said load-dependent displacement means. 
     
     
       3. The apparatus as defined in claim 2, wherein the load-dependent displacement means comprises a swingable lever the free end of which acts upon said valve member, said lever being loaded with a force in dependence on the regulator rod position. 
     
     
       4. The apparatus as defined in claim 3, wherein the load-dependent displacement means further comprises: at least one adjustable cam plate; guide means; said at least one prestressed spring disposed between the guide means and the swingable lever, and wherein said at least one adjustable cam plate is rotatable in dependence on the movement of the regulator rod and the guide means is displaceable by said at least one adjustable cam plate. 
     
     
       5. The apparatus as defined in claim 4, wherein the guie means comprises a guide rod and a sleeve displaceable on the guide rod, said guide sleeve having a contact connection for said spring. 
     
     
       6. The apparatus as defined in claim 5, wherein the load-dependent displacement means comprises identical parallel cam plates, one on each side of the guide rod, wherein the guide sleeve has a front face which contacts the cam plates. 
     
     
       7. The apparatus as defined in claim 3, wherein the load-dependent displacement means further comprises an adjustable stop which limits the pivotal movement of the swingable lever. 
     
     
       8. The apparatus as defined in claim 1, wherein the load-dependent displacement means comprises: at least one adjustable cam plate; and means for actuating said at least one adjustable cam plate for further displacing said valve member. 
     
     
       9. The apparatus as defined in claim 8, wherein said at least one adjustable cam plate is actuated for further displacing said valve member against the force of said at least one prestressed spring. 
     
     
       10. The apparatus as defined in claim 9, wherein the fuel injection pump includes a regulator rod having a toothed portion, wherein the means for actuating said at least one adjustable cam plate comprises a rotatable shaft on which said at least one adjustable cam plate is mounted, and a gear wheel mounted to said rotatable shaft which meshes with the toothed portion of the regulator rod, and wherein the regulator rod applies a load-dependent input to said load-dependent displacement means. 
     
     
       11. The apparatus as defined in claim 9, wherein the fuel injection pump includes a regulator rod, wherein the means for actuating said at least one adjustable cam plate comprises a hydraulically guided subsequent follow-up piston having a toothed portion, a rotatable shaft on which said at least one adjustable cam plate is mounted, and a gear wheel mounted to said rotatable shaft which meshes with the toothed portion of the follow-up piston, and wherein the regulator rod cooperates with the follow-up piston. 
     
     
       12. The apparatus as defined in claim 8, wherein the load-dependent displacement means further comprises: guide means; a swingable lever; said at least one prestressed spring disposed between the guide means and the swingable lever, and wherein said at least one adjustable cam plate is rotatable in dependence on the movement of the regulator rod and the guide means is displaceable by said at least one adjustable cam plate. 
     
     
       13. The apparatus as defined in claim 12, wherein the guide means comprises a guide rod and a sleeve displaceable on the guide rod, said guide sleeve having a contact connection for said spring. 
     
     
       14. The apparatus as defined in claim 13, wherein the load-dependent displacement means comprises identical parallel cam plates, one one each side of the guide rod, wherein the guide sleeve has a front face which contacts the cam plates.